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Zinus

ZINUS 5 Inch Metal Smart Box Spring with Quick Assembly, Mattress Foundation, Strong Metal Frame, Easy Assembly, California King

  • Based on 22,842 reviews
Condition: New
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Availability: Only 5 left in stock, order soon!
Fulfilled by THE GREEN HOUSE
Arrives Aug 5 – Aug 10
Order within 10 hours and 19 minutes
Available payment plans shown during checkout

Style: New/upgraded with quick assembly


Size: California King


Features

  • Steel Interior Frame With Poly Jacquard
  • STRONG, DEPENDABLE, AND READY IN NO TIME - As if its ultra-durable steel structure and convenient packaging werent impressive enough, our original Smart BoxSpring has been given a quick-assembly upgrade
  • DURABLY ENGINEERED - Durable steel is used to construct the inside framework of this foundation; twin/twin xl sizes support a maximum weight capacity of 350 lbs, while all other sizes can support up to 700 lbs
  • EASIER THAN EVER ASSEMBLY - With fewer bolts and tool-free locking brackets for intuitive setup, assembly takes only minutes to complete
  • THOUGHTFULLY PACKAGED - All parts and instructions are packed into one compact box that ships straight to your door
  • Worry-free 5 year limited warranty included; box spring only, a bed frame or platform bed is required to support this foundation and is sold separately

Description

As the backbone for solid mattress support, a box spring that falls short can make or break your night’s sleep. We developed the Smart BoxSpring® with unbeatable durability and rock-solid stability to keep your mattress in shape for years to come. And our latest quick assembly version gives you total confidence when it comes to setup, requiring fewer bolts and ingeniously designed with easy to use, tool-free brackets. With our simple, step-by-step instructions on hand, you’ll have this foundation built and ready to use within minutes. Built with a strong and durable steel frame and a versatile poly jacquard cover that slips right on, the Smart BoxSpring® is the picture of dependability for any mattress. All packed in a compact shipping box with everything included, even our 5-year worry free warranty! Now that’s peace of mind you can sleep on.

Size: California King


Product Dimensions: 83"L x 71.5"W x 5"H


Special Feature: Durable


Color: Grey


Finish Type: Steel


Size: California King


Product Dimensions: 83"L x 71.5"W x 5"H


Special Feature: Durable


Color: Grey


Finish Type: Steel


Included Components: Steel Frame, Cover, Slat


Compatible With Mattress Size: California king


Brand: Zinus


Furniture Finish: Alloy Steel


Product Care Instructions: Wipe with Dry Cloth


Assembly Required: Yes


Ground To Item Distance: 5 Inches


Manufacturer: Zinus


UPC: 841550325317


Global Trade Identification Number: 17


Item Weight: 42.1 pounds


Item model number: ZU-ABS-5CS


Fabric Type: Steel Interior Frame With Poly Jacquard


Finish types: Steel


Warranty Description: Worry-free 5 year limited warranty included.


Batteries required: No


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Aug 5 – Aug 10

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Buy it!! So easy to assemble, very sturdy
Style: New/upgraded with quick assembly Size: Queen
Buy it, don’t hesitate. I chose the “New/upgraded with quick assembly” rather than “Original” option because easy assembly was important to me. I purchased the 5 inch box spring because I needed only a little lift for my queen mattress. This item is so perfect and SO easy to assemble! I got the box in the house alone and assembled it alone. Took 1 hour. The only hiccup was when I placed the middle connectors upside-down - make sure the holes are facing up only on the middle connector pieces marked “G” so that the middle rack can slide down into that slot. It’s a pain to disconnect if you place it wrong. The cover is so easy to get on, just like a fitted sheet. It did not slide off at all while placing the box spring onto the platform bed frame, which I also did alone. It doesn’t squeak or slide around. Love it!! ... show more
Reviewed in the United States on June 29, 2025 by DeAnne
    • Super Easy to Assemble & Very Sturdy!
Style: New/upgraded with quick assembly Size: Twin
I was surprised at how quick and easy this box spring was to put together, it took me less than 5 minutes. The height is perfect for keeping my 18 month olds bed at a comfortable height to ensure if she does fall off her bed it’s not too high. The metal frame feels solid and not only supports the mattress and her really well but also an adult. This made the transition from crib to bed effortless, she’s gotten such good sleep on her new bed. No creaking or wobbling so far. Great value for the price—I’d definitely recommend it! ... show more
Reviewed in the United States on July 10, 2025 by Court
    • Solid for the price
Style: Original Size: Full
I purchased the ZINUS 5 Inch Metal Smart Box Spring over two years ago, and it has proven to be an excellent investment for my bed setup. Here are my thoughts on this product based on my experience: Pros: Easy to Assemble: The assembly process was incredibly straightforward. The box spring came with clear instructions and all the necessary tools, allowing me to put it together in about 30 minutes without any hassle. The parts fit together perfectly, making the entire process smooth and stress-free. Lightweight: Despite its sturdy construction, the box spring is relatively lightweight. This made it easy to maneuver and position in my bedroom. It's a great option for those who might need to move it around or set it up alone. Durability: After two years of daily use, the ZINUS Metal Smart Box Spring is still going strong. There has been no noticeable wear or tear, and it continues to provide stable and reliable support for my mattress. The metal frame is robust and shows no signs of bending or sagging. Design: The 5-inch height is perfect for those who prefer a lower bed profile. It provides ample support without adding unnecessary height, maintaining a sleek and modern look. Cons: Aesthetic: While the metal frame is functional and sturdy, it might not appeal to everyone aesthetically. However, since it's typically covered by a bed skirt or mattress, this is a minor issue. In conclusion, the ZINUS 5 Inch Metal Smart Box Spring has been an excellent choice for my bed. Its ease of assembly, lightweight nature, and lasting durability make it a standout product. After two years, it continues to perform just as well as it did on day one. I highly recommend it to anyone in need of a reliable and straightforward box spring solution. ... show more
Reviewed in the United States on May 17, 2024 by Clint Rodricks
    • Purchased For Toddler, Nice Product But Not Actually A Box Spring
Style: Original Size: Full
Before I get into the review, it's important to know this product is NOT a box spring. It's a metal foundation. There is a difference between the two. You can Google it for more details but the traditional box spring actually contains spring coils similar to a mattress. The purpose of the box spring coils is that when paired with a mattress, it works to take in some of the shock from normal use, as well as serve to help limit any undo wear to the mattress. So with that said, this product is a FOUNDATION, not a box spring. Now that we have the product clarification out of the way, now for the actual review. Our soon-to-be 3 Y.O. has been sleeping in her toddler bed (converted from her crib) and thought it was time for her to move to a regular bed. She is potty trained and we decided there's really no reason to keep her in the toddler bed. Luckily our crib is a 4-in-1, with the last conversion being a full-size bed. After researching online, I found that getting a low-profile box spring is preferred for toddlers so they can get in & out of bed. Otherwise the size of a mattress + box spring + bed frame would be too high for her. I tried shopping for a low profile box spring locally at various mattress stores and couldn't find anything cheaper than over $100 (plus they wanted $50 for delivery). So I just ended up finding this product on Amazon along with the mattress. For those of you wondering, I paired it with this product: Home Life Harmony Sleep 8" Pocket Spring Luxury Mattress, Full, White. Assembly was easy and took about 15-20 minutes. The instructions just consisted of pictures, so you just match the pieces in the picture. One reason I am docking a star is because one of the support bars on one of the pieces welded incorrectly. It actually caused the piece to not match up with the bolt hole. I had to "bend" the piece in order for it to line up with the bolt hole. In addition, some spots of the metal where it wasn't coated (metal spots near the weld were exposed) showed signs of minor rust. With those issues aside, this product makes for a VERY STURDY foundation. Fully assembled, it does not bend at all and is a perfect platform for the mattress. I do like how the product comes with a cover (to make it appear like traditional box springs). I just hope that no one jumps on it when exposed because I distinctly remember jumping on the box springs when I was a kid. Otherwise they'll slip right through. Good product! ... show more
Reviewed in the United States on January 7, 2017 by Hyoun Kim
    • Easy assembly, perfect fit
Style: New/upgraded with quick assembly Size: Full
This is my first Amazon review, and I want to share how impressed I was with this foundation. I had bought a different brand metal foundation which was sadly slightly too large for my full bed. I ordered this hoping it would be lower profile and it was a perfect fit. In comparing the two foundations, I also noted that this was far easier to assemble. Will be easy to take apart for moving. Feels sturdy, expect it will last a long time. Very pleased with the experience especially compared to similar products, and for a great price. ... show more
Reviewed in the United States on May 29, 2025 by H Niel

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